ARIMAX modeling

How do i used the significant lag number obtained from Cross Correlation Function (CCF) analysis in ARIMA/ARIMAX modeling?

I am working on multivariate ARIMA (ARIMAX) modeling in R. I have figured out the CCF plot after prewhitening. Got the significant lag numbers. Now, how can I convert the specific lagged variable to independent variable and incorporate in the ARIMAX modeling?

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